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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesNASA’s October 7, 2026 Astronomy Picture of the Day shows Pa 30, a nebula observed with the Gemini North Telescope in Hawai‘i. Its striking radial filaments carry pearl-like knots; Pa 30 is believed to be the remnant of the guest star recorded in 1181, though both that identification and the proposed explanation for the explosion remain qualified.
What is Pa 30?
Pa 30 is a nebula associated with a very hot central star. In the Gemini North image featured by NASA, narrow filaments stream outward from the center, creating a wheel-like pattern. The knots along those filaments give the structure a beaded appearance. NASA describes those pearl-like knots as about 4 light-days in diameter.
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The image is an astronomical observation, not a depiction of the nebula changing in real time. Its importance lies in the structure it reveals: the filaments and their knots provide clues to how material from the ancient explosion was distributed.
Is Pa 30 the remnant of the supernova seen in 1181?
Pa 30 is considered the likely remnant of the guest star observed in 1181. Historical accounts from Chinese, Japanese, and Arabic astronomers describe a bright “guest star” that remained visible for 185 days, according to NASA’s October 7, 2026 APOD. Astronomers associate that event with Pa 30, but the identification is not presented as certain.
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NASA calls the origin of the nebula an “845-year old mystery (and counting).” That wording reflects the age of the proposed event as of the feature’s publication, alongside the fact that important details about the explosion remain unresolved.
What are the filaments around Pa 30?
The image’s most prominent feature is the set of radial filaments extending from the central star. NASA suggests that the star is extremely hot and produces a strong wind that may have helped form them. This is a possible explanation for the pattern, not a settled account of how every filament and knot formed.
The knots matter because they show that the ejecta are not simply smooth strands. A 2026 preprint reports that this resolved clumpy substructure offers a new observational constraint for models of the filamentary ejecta. It also finds that the measured center of the nebula is consistent with the position of the central star.
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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →In the preprint’s analysis, the alignment yields a 3-sigma upper limit of less than 14 km/s for a transverse kick. That is a model-dependent limit, not a direct demonstration of what caused the supernova or shaped the nebula.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What caused the Pa 30 supernova?
The event is classified as an unusual Type Iax supernova, and a merger of two white dwarfs has been proposed as its cause. NASA’s 2026 feature explicitly notes that astronomers do not know exactly what happened, so the merger scenario should be understood as an explanation under consideration rather than a confirmed reconstruction.
A previous NASA APOD described the central blue object as a hypothesized surviving white dwarf, sometimes informally called a “zombie star.” That possibility fits some proposed accounts of a Type Iax event, but it remains a hypothesis; it does not establish the merger scenario as fact.
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What the image and evidence establish
- Observed: Gemini North captured Pa 30’s radial filaments and pearl-like knots.
- Historical link: Records describe a guest star in 1181, and Pa 30 is believed to be its remnant.
- Proposed physics: The event is described as Type Iax, with a two-white-dwarf merger among the proposed explanations.
- Open question: A strong wind from the central star may have shaped the filaments, but the precise history of the nebula is not settled.
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